I collected the character codes returned by OPL on a Nokia 3650.
Keypad:
numeric (0-9) 48-57
* 42
# 35
Navigation:
Scroll up 256
Scroll down 257
Scroll right 258
Scroll left 259
Selection Key -1979
Call Handling:
End Key -1949 (-> Phone screen)
Send Key -1950
Other:
Applications -1966 (-> Menu)
left Softkey -1982
right Softkey -1981
Edit Key -2037
Clear Key 8
Maybe the list useful for one or another.
Martin